If you read the Summary Notes associated with the WSUS Update KB 2720211, you will see that it recommends using the WSUS Cleanup Wizard and to re-index the WSUS DB.
Running the WSUS Cleanup wizard is something that I do with all my SBS servers — either manually, or via a scheduled task (see Eriq Neale’s blog post on this subject).
However, I was unaware of any need to re-index the WSUS database.
I asked some of my fellow SBS MVPs to see if this is something they do, and several responded that they, too, were not aware of any need to re-index the WSUS database, and had never run it.
The steps to re-index the WSUS DB can be found in this Technet article.
YMMV!